BepInEx/BepInEx.Preloader/RuntimeFixes/UnityPatches.cs

using System;
using System.Collections.Generic;
using System.Reflection;
using HarmonyLib;

namespace BepInEx.Preloader.RuntimeFixes
{
	internal static class UnityPatches
	{
		private static HarmonyLib.Harmony HarmonyInstance { get; set; }

		public static Dictionary<string, string> AssemblyLocations { get; } = new Dictionary<string, string>(StringComparer.InvariantCultureIgnoreCase);

		public static void Apply()
		{
			HarmonyInstance = HarmonyLib.Harmony.CreateAndPatchAll(typeof(UnityPatches));

			try
			{
				TraceFix.ApplyFix();
			}
			catch { } //ignore everything, if it's thrown an exception, we're using an assembly that has already fixed this
		}

		[HarmonyPostfix]
		[HarmonyPatch(typeof(Assembly), nameof(Assembly.Location), MethodType.Getter)]
		public static void GetLocation(ref string __result, Assembly __instance)
		{
			if (AssemblyLocations.TryGetValue(__instance.FullName, out string location))
				__result = location;
		}

		[HarmonyPostfix]
		[HarmonyPatch(typeof(Assembly), nameof(Assembly.CodeBase), MethodType.Getter)]
		public static void GetCodeBase(ref string __result, Assembly __instance)
		{
			if (AssemblyLocations.TryGetValue(__instance.FullName, out string location))
				__result = $"file://{location.Replace('\\', '/')}";
		}
	}
}